Under the power management tab, I have the option to put the computer to sleep when inactive for 10 minutes, 30 minutes, 1 hour or 2 hours. Is there a configuration file I can edit to add 4 hours to that menu?
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I have not tested it, but it should be possible to do it with gconf-editor program. Start it and search (keyboard shortcut Ctrl-F) for sleep_computer_ac key and set its value to 14400 seconds.